CVE-2022-49506 (GCVE-0-2022-49506)
Vulnerability from cvelistv5
Published
2025-02-26 02:13
Modified
2025-05-04 08:39
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
drm/mediatek: Add vblank register/unregister callback functions
We encountered a kernel panic issue that callback data will be NULL when
it's using in ovl irq handler. There is a timing issue between
mtk_disp_ovl_irq_handler() and mtk_ovl_disable_vblank().
To resolve this issue, we use the flow to register/unregister vblank cb:
- Register callback function and callback data when crtc creates.
- Unregister callback function and callback data when crtc destroies.
With this solution, we can assure callback data will not be NULL when
vblank is disable.
References
Impacted products
{
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"programFiles": [
"drivers/gpu/drm/mediatek/mtk_disp_drv.h",
"drivers/gpu/drm/mediatek/mtk_disp_ovl.c",
"drivers/gpu/drm/mediatek/mtk_disp_rdma.c",
"drivers/gpu/drm/mediatek/mtk_drm_crtc.c",
"drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c",
"drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h"
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"drivers/gpu/drm/mediatek/mtk_disp_ovl.c",
"drivers/gpu/drm/mediatek/mtk_disp_rdma.c",
"drivers/gpu/drm/mediatek/mtk_drm_crtc.c",
"drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c",
"drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h"
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{
"lessThanOrEqual": "*",
"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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"descriptions": [
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/mediatek: Add vblank register/unregister callback functions\n\nWe encountered a kernel panic issue that callback data will be NULL when\nit\u0027s using in ovl irq handler. There is a timing issue between\nmtk_disp_ovl_irq_handler() and mtk_ovl_disable_vblank().\n\nTo resolve this issue, we use the flow to register/unregister vblank cb:\n- Register callback function and callback data when crtc creates.\n- Unregister callback function and callback data when crtc destroies.\n\nWith this solution, we can assure callback data will not be NULL when\nvblank is disable."
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{
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"datePublished": "2025-02-26T02:13:38.168Z",
"dateReserved": "2025-02-26T02:08:31.586Z",
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